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Abstract:

Forty-eight mixed-breed steers from two
sources were used in a 141-day feedlot study to
compare a control ration (C) with a ration
containing magnesium-mica (MM; 9 lb/ton).
No diet cattle source interactions were
detected. Steer gain, efficiency, and cost of gain
did not differ (P>.10) between diets. Marbling
score tended (P<.10) to be greater and the
percentage of cattle grading USDA Choice and
net carcass value were greater (P<.05) for steers
fed MM. Feeding MM in a feedlot ration may
have a substantial economic impact on feedlot
cattle.